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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f760dfbe622e41e42d2e28a6e0c14d2059cb3da6739bee2eea9cf0c83bfc8140' 
  AND token = '6HAbTbf3+OKc7biHtnDaG4kfGC/Vsecf4mKkBqWC80U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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