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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f282b9db0ca4a2f4b0f92661f12f219289e0851591c431c77066b7aa7b3c51' 
  AND token = 'Rc1YB5C/UvzJ2TKn7qir7Vm2X/5LMOeCr5803PsR4dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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