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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9128e3891e72d6c34e276a0af93e574c644eda35ea16ec0142f8447a43a5b8ca' 
  AND token = 'c+uGVWlWJiQcxdXyHc6p4SVjG2VSzoO8DtlM2YOLPIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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