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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80227b8c93530ff81c3f2a7ca87e2b81815ce84d4d60bb8e803a6ab0901300f6' 
  AND token = '6mRF1BU0nSL3UY2FwE4pxlRot1es2sz1YAizNxeHBRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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