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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5fba38248eb6a80fe3e5c135b91966f13f5bb44cb1640a2f829b4be716d190' 
  AND token = 'elfT7LHosSAzftcen/FeiOXrQR4Z/YBROVNnKnXtzVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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