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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf0992d0fb8f2798965e0919d212eee80d7c8c27938995d10402e29e5002c9e' 
  AND token = 'sCUnS0/AEd/ogJtMSxGeTyulW0Y8XfXUh0OuE5l/obU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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