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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495ad61ba8040880256cb036c1f2080dc7d12abd867a39ec8e34491752d16a6b' 
  AND token = 'Q5KNUZQ3GivBZc1gMhroc3zTvT4qg9ZvFS+NFHyIvCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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