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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23d94fa8f11cdde22a808cbeb3c4a4769ba802b3bfa0e828170b078d206290a' 
  AND token = '9lDcXCDNrHTdL1R4IXsn1QdQyxkcwib3a1xXXT1mLqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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