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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c1b2626a068d845bf26a67a16f167461cdae33b445f67f268ba0af724c1e3e' 
  AND token = '3Zeo/G7AUAP1I6hTJCps587Vtureo4lafiCY08XtOqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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