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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee157d3f82dd449ab5aad9147ab65dc5bc64cfe4bce0e9cc4fcc89bfe7dab36' 
  AND token = 'yn536lxRRz/x3EcHRj+ppWkS3pkbJM8Bt6WvjuDj9eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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