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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a781f3d12f11b498cae15a91b96a7f1877285f27dddbfd5a8383e81acdd9bdf' 
  AND token = 'QEeJiEhqEtgj4dxnoBI1/SscLvWWfO99ELn1mK03pVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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