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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ff8cf4855943bc9b4b5f574f763b9c7f99849c57c8c514f42a0c420017ab92' 
  AND token = 'nHtEQRyadnXysYZI/zFx0PLrsy5UrmdwKVovbqrYneQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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