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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4f764e8e25c65517a1dd51419f7ca328aca87055f811c2ba8c4f59c3cb8733' 
  AND token = 'pMYbbQnrs3BCn+NE6FzTDltMfCOC74hgnNglVBtLfAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}