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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8941d11e04de3e358ef4784aaef9c943f45234d7bb7893811c57ec1dc1d11a82' 
  AND token = 'lpF6Rd1h/gGOwdnwz+eraEMkpkIOmShMCk5YdRzA6g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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