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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd9d32a157b9cc8a2d7435bc76eae0a68797d0aaa51fd53c615836e3b95e3fc' 
  AND token = 'C32hGeICSuMyICUSSaB7n06b/xNp2GmcQZ5JfH6L3p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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