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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e9318c41bacafed8f843b5754818b76ed62ba2dede6c65875ea5e56556753b' 
  AND token = 'xRURfBU2QJWA3CL8sHxA8gBUkJEEZRF+RJkS4T/z4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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