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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b7fc598e729e893c9557b66ed2a54ea5ddcab1fe45088552d51846cdaeea2' 
  AND token = '9YqW05nKI0JLuCHG8m83RqWwTo2IHVULTmcD8IhUuuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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