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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739dcdc8864346669f43fe3ea7bb3e6d45caa873dc82166718e1075a0e5b7004' 
  AND token = '/6AdLTRr1nIw9gUW1Gasdel6/EiogKiZJPERNfR5/Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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