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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84571626f2990467a941c79bc6052e47c691ec4c2f58c97f6912a4953e6e73b' 
  AND token = 'rl/tTz9V5G6jYR7gp6R4ziVGD0SXF7jc7NkECJ9DaFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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