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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af11b995a79f6971941e92fc865d13db1f0932a358f460b3ae881eb54a3200c' 
  AND token = 'PSm22dLM0yDK7/hEDJIU0bG/q4ronvUCouCkvQgW1dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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