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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6118d8ae724ec7678287831ea52b825411aae400c3d5ec160c09bc0d3bbb963' 
  AND token = 'iFKvDQ/XaDJ+pRG0o8mMx+046d9JfiPx15jiLMdNrQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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