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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6552a028c64c45a6084e2f57cc108a782bb64d4226f191037127aeabd932d9ed' 
  AND token = 'umKed8dU0HRS/tC72ewoyW2wNpdqJ2THSE0PZvEm28Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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