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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f9ec2cf72f2b34b6c6eab52d457e07304a0b0c0faa86bfd52c4f92b826565a' 
  AND token = '3W1Fj6D3ALQToYm8IISN+rEwhWFhFFHgS1lyUMxdvpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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