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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8563c4555580248bff8c90daffe56061ed0d693e3518be869db5ecf8f1f8c016' 
  AND token = 'x45jCSWPvjzT48Ae9ospd/d5Qt9bo63TTQ9skSiwZAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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