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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02136c2c3cbf6792b8cf237d1a1c914bdfa8094bc6fdf2f758474e1054c73c03' 
  AND token = '1CtaZuEZhqH2E8mVkydQkKDUQcQW63PeR1mFujTcHA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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