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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c094500c137f3a59f51b8e0dcb16007dd4e21654e48e1ce450373bc8ed6a351' 
  AND token = 'rHCBjoh0vRp7H0dSiDMPbdOEpqNXH5mlG91mEq4BXXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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