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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c810cd75083651decc9cac74e8b80de8ff76d4b11968372c513eb7b2c75fa4' 
  AND token = 'XkwOWYEIdyHPhhKHB3oPHknHPyIPzFZ+59D5ObN+C2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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