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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a813972a8a5942a9e991a431edd5d40716b596c0486d8bf78f39e21058265b15' 
  AND token = 'bMNvoRqrrg2rqBziivbCRKuIW1wB4qahI1jrk9lo6BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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