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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f296fb63492c0e8dfe8eec266f911ef410420284b9c424cdd98cae034bfcfd' 
  AND token = 'i96q4Hjd5eFru0Rj5TWUAhSD75PE6fWrkaQEzLaWsaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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