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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c863fc22196ca1ecf64e54a85f9318b27ff8d2ee5c6f8dd7975ef30f77b1af96' 
  AND token = 'Vwa5mW8c5vfmKiUzxcPgEFjoSKQG7AcBOx5SxeTWVNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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