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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668a8ba5d3c242b0c79d4241c90dea4817576edcb4ad8f959605ec0f58822255' 
  AND token = '/BjbEdtgf6T99I31uP3V4UdhxawkestLdzyGx43O1P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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