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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8a698917ce03db71fa5f869bd45ec1aec0a477a138cdb007cf2b1d1156f0ca' 
  AND token = 'JHxJnWqpguLm3QWDNC7Xru4PS9st0S//yM3kqmBe0E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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