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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd8f4f9186a0a70d0bb3f51a985bc8ebe76fa7a3e112f46c685ee3b2e1a19c3' 
  AND token = 'EgCNEoFM5lBir8SNo2WIGIHqrMQPfUQU9vzMx1Tof+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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