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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fce54168999a55eaeebc28708edde07b9a72b2e926f3f503a90117b68e74195' 
  AND token = 'BD+tx8Ibpie01fhT5CVPU1MxEF/sDwVcXt+AFHyn874=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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