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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c5542bd027f7396beb1f2edba7b1b03615e8466fec14d0ef952af86e5277a6' 
  AND token = 'i+7vhG3mQ7n6v/oCylhuMatCI35B2HeB7Orh4h8Wtzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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