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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba58087366d455ba2eb4c06ba710d299acfd15e8e297b3e5c0599415a237e214' 
  AND token = '/enpGmDc23zaOSyQyFoIQcQq/5EqtVbiGM5TuPkHqLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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