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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b76111982849882cb228ab6f9cbacaf0f3bebfd329dd33268923b2c34ec9138' 
  AND token = '6kRKRx/fqw7bS5wk6Kdo6Nps8bdXCoj1zVy0W/7R5ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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