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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd4067ff426fe98bf5bdb543d59269df99df0eb4eae39f5922aba1c71b88167' 
  AND token = 'Bi7isJj8uKa2Ko//ddyDr3SkFpB+ctEBXQhaCcDSyt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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