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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894c5526aa7f827657f2c28ecc3488d48350c94fbda69c34fb2d92295a06e0fb' 
  AND token = 'uRnFbh/WHrvpzOBjWp2gphpMn4eF4msuas0Hu16DJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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