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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9690247cb6df502c28a6a1cf53d863fd1f801d6e2cf49fbfd824678d82a3a8d8' 
  AND token = '8CJNfa8kA5PeQpehK5gLBeYjaHJgrxDo+/SKdh5WrO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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