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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282c1b7277c77018443d59be22a07b4f85608552c3cb87bc681adcf80076733f' 
  AND token = 'R2srNkc3vquuZ0Hn/XEUk3xyoJJbmr19SGK3oTEHhZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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