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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f797a25d54fccf75162688feb70269a849c503a6482a8f85aae81e529a0f52' 
  AND token = 'SFymoZDdcnmsdAtofpUzzC91S64KkNvji8f3l4apnwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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