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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513b4b9880d4a0fa3e8966b762411a89ef3005926983f880e8c7d9afd3b7fdf7' 
  AND token = 'KTk10gzUkgOLs20FNpPN6GRfQSbVUYevSoIWuO4WKJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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