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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d16a6fd8b68570df2b843157232374c76b087fba0c920500486f4863f740455' 
  AND token = 'xvk+H75c7WVtZdelx4Xpyz0ZTCLDQ3xQ4y6WhfouiSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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