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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c072b45b7b8417190153afaddeb8422ca2d731910c6c7a29365ac3a6fbd277df' 
  AND token = 'YC636UgdASHFfYJanjnFnJ5loY0rv5ZufzAyNUFeM8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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