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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8141cff3f109a167806536d234eebbc541e5efcb5938b55b1255bded81ed93a' 
  AND token = 'bAtyalfxJ1AeuJHtgA/GSQWvfYdWrDIp/FycQQykSuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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