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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd16a9c3f94e8b21ce66abc3c7bdde2f341fdfc780cfc12e5c9aee7b82f62b36' 
  AND token = 'hh/KbVKU86S6X+lbNpntT9ebdGiyoEgmFNcbRrSbd3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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