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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8f2b637fb50fcd2ebf662a734ceb8e0c7baf559412c4bb4536c252bf8c9835' 
  AND token = '3TsFqTgE+D/rQ6wbw5fzizBJ7n10Q103adESvytJn9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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