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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2daffe705786db9daa4b564b47b38b47fcc23d97b95e802e46023c4d8848f4' 
  AND token = 'S0CO0hvFxr5246K+2RuRXVIrCl7hXWKLPPZ1mm9B/8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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