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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf2fb2cfd04c6652e55af4fed7a062b27acf7faf8d7b25e8c951d8a025d23bd' 
  AND token = 'rSqma9oxRXDC2xX6NWXCFErL3ZdQ1PAW1RbR+3PR0QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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