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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75df70aabbb94b63a4705d52ba1366bd7438c9739c57dc8696bc77ffef1264e' 
  AND token = 'RTjMc5sR/UIFGJ/zltA3zsiQC8L/CwJNH9xreu2pwMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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