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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7747a46ec2b1b1bb7885b761c5ba4e2417c14547003de6a58e2b32e95615b173' 
  AND token = 'SsvQkS1/EHn7ZW2jEWkD/TE0vmITXe1XFQrpWAqC+vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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