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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9c95c4bc210f2ed6cc0022af81cc69c32f7bc58c81c5d62168ef962bb1fdfd' 
  AND token = 'xNsbp9f8Vu5ihTUPLPlkP555+OolJgAKvOkSZeZ4wJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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