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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8810f20ec4abcb98687b2f156667b4da0a3a3992d1b543ca7f0ab99a557f55' 
  AND token = '0m9+NkOrrzYhdMDYc+g9rb/acrvBWPD8i106gWnmrPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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