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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8f5262cfb97473206474b5b1b8884dde59ea96edce9678234910747683de84' 
  AND token = 'aJfHql4nQ4Ejxgj2S0oBimukMpL3zLAE1HDNGILz8sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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