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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0e33689b47095d72195c88e813146a426f9cd7b8a45ef1fd1e083f2c1dcccd' 
  AND token = 'eTj1725Pbtsfue8BfzyKV1Tv0F4V82BemQWFaeVR8aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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