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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e048d09549572c6d113794e53a20df90a40d5a634646cf996e980eb24ca59aae' 
  AND token = '/GpVAiVIvToXKVLChHD+ncXKODpBiTCn0C1pIuFZebY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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