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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec86fcd9884edd8c899aec9c75ca0c4e448b4f9025114108352ac466a0e932d' 
  AND token = 'WBL522l1A2jZBrfr4shADW4+F56e2xN8C1RS1W25qA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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