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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a19a3d8c3c8bd916c21efdcc3707b5b5576663a414129096aeb0395ac3e7f77' 
  AND token = 'IeDBa/Zy1DpuXi1KrlpCxBRWiXTgO+T0MR0YbhtwoNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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