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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562acdae8f723d76f60a9ceb5e55003c3e1b8b17d86f75939532a954b9f4c2b9' 
  AND token = '/8v5EOZIZkNbo1s650g1M5hmH5vsV9vb5xNcG0xQCyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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