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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a2149dce7cba5375f7e9216e3edf675225e5b0400a67d6c29acb74bbec84da' 
  AND token = 'rF4FUiQERcUqq3tQC+oh5+s2Np3dViaNHupKgLPHILw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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