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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dc2d622ad8923749f6ee55c0443207e3c1d42f369597253994bfb1b8fe7f93' 
  AND token = 'SxvrIsnofjcZG7uB0lYFNliYIeHrG9b5yy0wtJJsFeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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