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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34ca9833d96db6340464b7649648b3cff959fd8a6b15e39c49f80485c0b6a09' 
  AND token = 'ouj5QsUsiDcxS7Cw/hEI8IUyzxL5acGHJwCWlKmAV8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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