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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0108f0f891e84173d0095f4cf1b9d75d9b84544e0a72407ca4ce9221214cb26f' 
  AND token = 'TAnElXLSTu5+HEukGzkFphOdiyAqe7eIAHkgctGUcbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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