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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ffe6f8716b91fe8454b148d4a614be89f4f263a0fcb668af63965b22fc11a0' 
  AND token = 'tCX0AxDNopVJrLzq262c6vVUWaqt7yAM9f+4zk2GH7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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