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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d526be5b0dc86cbe36313c6988b0017dbc059abc17d4dba0718b26cf264a36' 
  AND token = 'jhZ7KbMm3wJQFvZ0FkMzn1n5IqHFy8FKLi3b8zHBl3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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