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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cc4c51aa935fd1be67c4cbc56eb3ce66082b67609ae5b33d91e5ab56ac61eb' 
  AND token = 'HP6OPzCCfm8eNuzGZYnTxj8ag8owKVcKxN9i6WqPJA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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